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Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Jan. 03, 2015
Before-Tax Amount      
Actuarial (loss)/gain recognized $ (5,257) $ (3,822) $ (34,547)
Amortization of actuarial loss 4,632 5,101 2,078
Actuarial prior service cost recognized     1,140
Amortization of curtailment 0 (1,181)  
Amortization of prior service costs 36 (67) 23
Amortization of settlement (114) 5,291  
Other 44 471  
Total defined benefit pension plans (659) 5,793 (31,306)
Tax (Expense) or Benefit      
Actuarial (loss)/gain recognized 1,396 1,499 12,001
Amortization of actuarial loss (1,786) (1,986) (806)
Actuarial prior service cost recognized     (261)
Amortization of curtailment 0 328  
Amortization of prior service costs (12) 36 (9)
Amortization of settlement 45 (1,468)  
Other 0 0  
Total defined benefit pension plans (357) (1,591) 10,925
Net-of-Tax Amount      
Actuarial (loss)/gain recognized (3,861) (2,323) (22,546)
Amortization of actuarial loss 2,846 3,115 1,272
Amortization of prior service costs 24 (31) 14
Actuarial prior service cost recognized 0 0 879
Amortization of curtailment 0 (853)  
Amortization of settlement (69) 3,823  
Other 44 471  
Total defined benefit pension plans (1,016) 4,202 (20,381)
Before-Tax Amount      
Gain/(loss) recognized in other comprehensive income (loss) 4,900 4,400  
Tax (Expense) or Benefit      
Gain/(loss) recognized in other comprehensive income (loss) (1,900) (1,700)  
Net-of-Tax Amount      
Other comprehensive income/(loss) (5,231) (153,755) (153,231)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent (753) (2,712) 11,794
Total other comprehensive income, net of tax (5,984) (156,467) (141,437)
Foreign currency translation adjustments (5,593) (162,436) (119,684)
Natural Gas Swap [Member]      
Before-Tax Amount      
Loss/(gain) reclassified to net income     (196)
Gain/(loss) recognized in other comprehensive income (loss)     11
Total natural gas derivatives     (185)
Tax (Expense) or Benefit      
Loss/(gain) reclassified to net income     76
Gain/(loss) recognized in other comprehensive income (loss)     (4)
Total natural gas derivatives     72
Net-of-Tax Amount      
Loss/(gain) reclassified to net income     (120)
Gain/(loss) recognized in other comprehensive income (loss)     7
Total natural gas derivatives     (113)
Interest Rate Swap [Member]      
Before-Tax Amount      
Loss/(gain) reclassified to net income     (119,684)
Tax (Expense) or Benefit      
Loss/(gain) reclassified to net income     0
Net-of-Tax Amount      
Loss/(gain) reclassified to net income     (119,684)
Corn Option [Member]      
Before-Tax Amount      
Loss/(gain) reclassified to net income (3,868) (1,517) (3,868)
Gain/(loss) recognized in other comprehensive income (loss) 4,889 4,405 1,812
Total natural gas derivatives 1,021 2,888 (2,056)
Tax (Expense) or Benefit      
Loss/(gain) reclassified to net income 1,501 589 1,501
Gain/(loss) recognized in other comprehensive income (loss) (1,897) (1,710) (704)
Total natural gas derivatives (396) 1,121 797
Net-of-Tax Amount      
Loss/(gain) reclassified to net income (2,367) (928) (2,367)
Gain/(loss) recognized in other comprehensive income (loss) 2,992 2,695 1,108
Total natural gas derivatives 625 1,767 (1,259)
Accumulated Other Comprehensive Income (Loss) [Member]      
Net-of-Tax Amount      
Total defined benefit pension plans (1,016) 4,202 (20,381)
Net-of-Tax Amount      
Total other comprehensive income, net of tax (3,697) (164,827) (125,884)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax (5,593) (162,436)  
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax 0 0  
Foreign currency translation adjustments (5,593) (162,436)  
Accumulated Other Comprehensive Income (Loss) [Member] | Natural Gas Swap [Member]      
Net-of-Tax Amount      
Total natural gas derivatives     (113)
Accumulated Other Comprehensive Income (Loss) [Member] | Corn Option [Member]      
Net-of-Tax Amount      
Total natural gas derivatives $ 625 $ 1,767 $ (1,259)